package apiday01.homework.string;

import java.util.Locale;

public class ToUpperCaseDemo {
    public static void main(String[] args) {
        String str = "我爱Java！！！";
        String upStr = str.toUpperCase();
        System.out.println(upStr);
        String lowStr = str.toLowerCase();
        System.out.println(lowStr);

    }
}
